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boyle’s law
Volume is inversely proportional to pressure at constant T and n
P1V1 = P2V2
charles’ law
volume is directly proportional to temperature in Kelvin at constant P and n
V1/V2 = T1/T2
Gay-Lussac’s law
pressure is directly proportional to temperature in kelvin at constant V and n
P1/P2 = T1/T2
combined gas law
P1V1/T1 = P2V2/T2 at constant n/m and T in kelvin
Avagadro’s law/hypothesis
number of moles of gas is directly proportional to volume at constant T and P
n1/n2 = V1/V2
Density of a gas
Dgas = mm/mV at specific T and P
Density
D = m/v
ideal gas law
PV = nRT
use ideal gas law to find density
D = m/V
V = m/D
substitute V = m/D into PV = nRT
Pm/d = nRT
Pm = nRTD
D = Pm/nRT
use ideal gas law to find molar volume
PV = nRT
V = nRT/P
V/n = RT/P
since V/n is molar volume, mV = RT / P
use ideal gas law to find mm
substitute n = m/mm into PV = nRT
PV = mRT/mm
mmPV = mRT
mm = mRT/PV
standard conditions
PSTP = 101.3 kPa
TSTP = 0.00000 degrees C or 273.15 K
mVSTP = 22.4 L/mol
Standard Ambient Temperature and Pressure
PSATP = 100.0 kPa
TSATP = 25.00 degrees C = 298.15 kPa
mVSATP = 24.8 L/mol
universal gas constant
R = 8.314 kPaL/Kmol
Pressure formula
P = force /area
ng ∝ V
mole ratios of reacting gases are equal to volume ratios at constant T, P
makes it so that volume ratios are mole ratios
only for ideal gases
cannot use for other states
density of water at SATP
1.00 g/ml
how to determine mass of water depending on density at SATP
DH2O = 1.00g/ml
for example, VH2O = 50.0 ml
g = D x V = (1.00 g/ml)(50.0 ml)
g = 50.0 g
pressure = force / area
newtons (N) / m2 = Pascal (Pa)
directly proportional units of pressure
101.3 kPa = 1.00 atm = 760.00 mmHg or 760.0 torr
all units of measurement conversions
P: peta 1015
T: tetra 1012
G: giga 109
M: mega 106
k: kilo 103
h: hecto 102
da: deca 101
100
d: deci 10-1
c: centi 10-2
m: milli 10-3
µ: micro 10-6
n: nano 10-9
p: pico 10-12
f: femto 10-15